Husker,do not believe all of the stories regatrding overheating. If someone's system did overheat it was probably due to where they placed it, giving it little/ no air flow. My PS3 runs 24/7 for the most part between playing games, checking the store and doing the Folding@Home. It feels no warmer than it would after half an hour of gameplay. As long as you have the system in a place that is somewhat open (maybe sitting on a stand beside the tv) you will be fine.
As for the game console coolers, do not waste your money on any of them. All they are is an attempt to cash in on paranoia. Using them may actually restrict the air coming out and do more damage to your system than good.